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FFmpeg/libavfilter/af_dialoguenhance.c

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/*
* Copyright (c) 2022 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavutil/tx.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "internal.h"
#include "window_func.h"
#include <float.h>
typedef struct AudioDialogueEnhancementContext {
const AVClass *class;
double original, enhance, voice;
int fft_size;
int overlap;
float *window;
float prev_vad;
AVFrame *in;
AVFrame *in_frame;
AVFrame *out_dist_frame;
AVFrame *windowed_frame;
AVFrame *windowed_out;
AVFrame *windowed_prev;
AVFrame *center_frame;
AVTXContext *tx_ctx[2], *itx_ctx;
av_tx_fn tx_fn, itx_fn;
} AudioDialogueEnhanceContext;
#define OFFSET(x) offsetof(AudioDialogueEnhanceContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption dialoguenhance_options[] = {
{ "original", "set original center factor", OFFSET(original), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
{ "enhance", "set dialogue enhance factor",OFFSET(enhance), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 3, FLAGS },
{ "voice", "set voice detection factor", OFFSET(voice), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 2,32, FLAGS },
{NULL}
};
AVFILTER_DEFINE_CLASS(dialoguenhance);
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats = NULL;
AVFilterChannelLayouts *in_layout = NULL, *out_layout = NULL;
int ret;
if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLTP )) < 0 ||
(ret = ff_set_common_formats (ctx , formats )) < 0 ||
(ret = ff_add_channel_layout (&in_layout , &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) < 0 ||
(ret = ff_channel_layouts_ref(in_layout, &ctx->inputs[0]->outcfg.channel_layouts)) < 0 ||
(ret = ff_add_channel_layout (&out_layout , &(AVChannelLayout)AV_CHANNEL_LAYOUT_SURROUND)) < 0 ||
(ret = ff_channel_layouts_ref(out_layout, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
return ret;
return ff_set_common_all_samplerates(ctx);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
AudioDialogueEnhanceContext *s = ctx->priv;
float scale = 1.f, iscale, overlap;
int ret;
s->fft_size = inlink->sample_rate > 100000 ? 8192 : inlink->sample_rate > 50000 ? 4096 : 2048;
s->overlap = s->fft_size / 4;
s->window = av_calloc(s->fft_size, sizeof(*s->window));
if (!s->window)
return AVERROR(ENOMEM);
s->in_frame = ff_get_audio_buffer(inlink, s->fft_size * 4);
s->center_frame = ff_get_audio_buffer(inlink, s->fft_size * 4);
s->out_dist_frame = ff_get_audio_buffer(inlink, s->fft_size * 4);
s->windowed_frame = ff_get_audio_buffer(inlink, s->fft_size * 4);
s->windowed_out = ff_get_audio_buffer(inlink, s->fft_size * 4);
s->windowed_prev = ff_get_audio_buffer(inlink, s->fft_size * 4);
if (!s->in_frame || !s->windowed_out || !s->windowed_prev ||
!s->out_dist_frame || !s->windowed_frame || !s->center_frame)
return AVERROR(ENOMEM);
generate_window_func(s->window, s->fft_size, WFUNC_SINE, &overlap);
iscale = 1.f / s->fft_size;
ret = av_tx_init(&s->tx_ctx[0], &s->tx_fn, AV_TX_FLOAT_RDFT, 0, s->fft_size, &scale, 0);
if (ret < 0)
return ret;
ret = av_tx_init(&s->tx_ctx[1], &s->tx_fn, AV_TX_FLOAT_RDFT, 0, s->fft_size, &scale, 0);
if (ret < 0)
return ret;
ret = av_tx_init(&s->itx_ctx, &s->itx_fn, AV_TX_FLOAT_RDFT, 1, s->fft_size, &iscale, 0);
if (ret < 0)
return ret;
return 0;
}
static void apply_window(AudioDialogueEnhanceContext *s,
const float *in_frame, float *out_frame, const int add_to_out_frame)
{
const float *window = s->window;
if (add_to_out_frame) {
for (int i = 0; i < s->fft_size; i++)
out_frame[i] += in_frame[i] * window[i];
} else {
for (int i = 0; i < s->fft_size; i++)
out_frame[i] = in_frame[i] * window[i];
}
}
static float sqrf(float x)
{
return x * x;
}
static void get_centere(AVComplexFloat *left, AVComplexFloat *right,
AVComplexFloat *center, int N)
{
for (int i = 0; i < N; i++) {
const float l_re = left[i].re;
const float l_im = left[i].im;
const float r_re = right[i].re;
const float r_im = right[i].im;
const float a = 0.5f * (1.f - sqrtf((sqrf(l_re - r_re) + sqrf(l_im - r_im))/
(sqrf(l_re + r_re) + sqrf(l_im + r_im) + FLT_EPSILON)));
center[i].re = a * (l_re + r_re);
center[i].im = a * (l_im + r_im);
}
}
static float flux(float *curf, float *prevf, int N)
{
AVComplexFloat *cur = (AVComplexFloat *)curf;
AVComplexFloat *prev = (AVComplexFloat *)prevf;
float sum = 0.f;
for (int i = 0; i < N; i++) {
float c_re = cur[i].re;
float c_im = cur[i].im;
float p_re = prev[i].re;
float p_im = prev[i].im;
sum += sqrf(hypotf(c_re, c_im) - hypotf(p_re, p_im));
}
return sum;
}
static float fluxlr(float *lf, float *lpf,
float *rf, float *rpf,
int N)
{
AVComplexFloat *l = (AVComplexFloat *)lf;
AVComplexFloat *lp = (AVComplexFloat *)lpf;
AVComplexFloat *r = (AVComplexFloat *)rf;
AVComplexFloat *rp = (AVComplexFloat *)rpf;
float sum = 0.f;
for (int i = 0; i < N; i++) {
float c_re = l[i].re - r[i].re;
float c_im = l[i].im - r[i].im;
float p_re = lp[i].re - rp[i].re;
float p_im = lp[i].im - rp[i].im;
sum += sqrf(hypotf(c_re, c_im) - hypotf(p_re, p_im));
}
return sum;
}
static float calc_vad(float fc, float flr, float a)
{
const float vad = a * (fc / (fc + flr) - 0.5f);
return av_clipf(vad, 0.f, 1.f);
}
static void get_final(float *c, float *l,
float *r, float vad, int N,
float original, float enhance)
{
AVComplexFloat *center = (AVComplexFloat *)c;
AVComplexFloat *left = (AVComplexFloat *)l;
AVComplexFloat *right = (AVComplexFloat *)r;
for (int i = 0; i < N; i++) {
float cP = sqrf(center[i].re) + sqrf(center[i].im);
float lrP = sqrf(left[i].re - right[i].re) + sqrf(left[i].im - right[i].im);
float G = cP / (cP + lrP + FLT_EPSILON);
float re, im;
re = center[i].re * (original + vad * G * enhance);
im = center[i].im * (original + vad * G * enhance);
center[i].re = re;
center[i].im = im;
}
}
static int de_stereo(AVFilterContext *ctx, AVFrame *out)
{
AudioDialogueEnhanceContext *s = ctx->priv;
float *center = (float *)s->center_frame->extended_data[0];
float *center_prev = (float *)s->center_frame->extended_data[1];
float *left_in = (float *)s->in_frame->extended_data[0];
float *right_in = (float *)s->in_frame->extended_data[1];
float *left_out = (float *)s->out_dist_frame->extended_data[0];
float *right_out = (float *)s->out_dist_frame->extended_data[1];
float *left_samples = (float *)s->in->extended_data[0];
float *right_samples = (float *)s->in->extended_data[1];
float *windowed_left = (float *)s->windowed_frame->extended_data[0];
float *windowed_right = (float *)s->windowed_frame->extended_data[1];
float *windowed_oleft = (float *)s->windowed_out->extended_data[0];
float *windowed_oright = (float *)s->windowed_out->extended_data[1];
float *windowed_pleft = (float *)s->windowed_prev->extended_data[0];
float *windowed_pright = (float *)s->windowed_prev->extended_data[1];
float *left_osamples = (float *)out->extended_data[0];
float *right_osamples = (float *)out->extended_data[1];
float *center_osamples = (float *)out->extended_data[2];
const int offset = s->fft_size - s->overlap;
float vad;
// shift in/out buffers
memmove(left_in, &left_in[s->overlap], offset * sizeof(float));
memmove(right_in, &right_in[s->overlap], offset * sizeof(float));
memmove(left_out, &left_out[s->overlap], offset * sizeof(float));
memmove(right_out, &right_out[s->overlap], offset * sizeof(float));
memcpy(&left_in[offset], left_samples, s->overlap * sizeof(float));
memcpy(&right_in[offset], right_samples, s->overlap * sizeof(float));
memset(&left_out[offset], 0, s->overlap * sizeof(float));
memset(&right_out[offset], 0, s->overlap * sizeof(float));
apply_window(s, left_in, windowed_left, 0);
apply_window(s, right_in, windowed_right, 0);
s->tx_fn(s->tx_ctx[0], windowed_oleft, windowed_left, sizeof(float));
s->tx_fn(s->tx_ctx[1], windowed_oright, windowed_right, sizeof(float));
get_centere((AVComplexFloat *)windowed_oleft,
(AVComplexFloat *)windowed_oright,
(AVComplexFloat *)center,
s->fft_size / 2 + 1);
vad = calc_vad(flux(center, center_prev, s->fft_size / 2 + 1),
fluxlr(windowed_oleft, windowed_pleft,
windowed_oright, windowed_pright, s->fft_size / 2 + 1), s->voice);
vad = vad * 0.1 + 0.9 * s->prev_vad;
s->prev_vad = vad;
memcpy(center_prev, center, s->fft_size * sizeof(float));
memcpy(windowed_pleft, windowed_oleft, s->fft_size * sizeof(float));
memcpy(windowed_pright, windowed_oright, s->fft_size * sizeof(float));
get_final(center, windowed_oleft, windowed_oright, vad, s->fft_size / 2 + 1,
s->original, s->enhance);
s->itx_fn(s->itx_ctx, windowed_oleft, center, sizeof(AVComplexFloat));
apply_window(s, windowed_oleft, left_out, 1);
for (int i = 0; i < s->overlap; i++) {
// 4 times overlap with squared hanning window results in 1.5 time increase in amplitude
if (!ctx->is_disabled)
center_osamples[i] = left_out[i] / 1.5f;
else
center_osamples[i] = 0.f;
left_osamples[i] = left_in[i];
right_osamples[i] = right_in[i];
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
AudioDialogueEnhanceContext *s = ctx->priv;
AVFrame *out;
int ret;
out = ff_get_audio_buffer(outlink, s->overlap);
if (!out) {
ret = AVERROR(ENOMEM);
goto fail;
}
s->in = in;
de_stereo(ctx, out);
out->pts = in->pts;
out->nb_samples = in->nb_samples;
ret = ff_filter_frame(outlink, out);
fail:
av_frame_free(&in);
s->in = NULL;
return ret < 0 ? ret : 0;
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
AudioDialogueEnhanceContext *s = ctx->priv;
AVFrame *in = NULL;
int ret = 0, status;
int64_t pts;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
ret = ff_inlink_consume_samples(inlink, s->overlap, s->overlap, &in);
if (ret < 0)
return ret;
if (ret > 0) {
return filter_frame(inlink, in);
} else if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
ff_outlink_set_status(outlink, status, pts);
return 0;
} else {
if (ff_inlink_queued_samples(inlink) >= s->overlap) {
ff_filter_set_ready(ctx, 10);
} else if (ff_outlink_frame_wanted(outlink)) {
ff_inlink_request_frame(inlink);
}
return 0;
}
}
static av_cold void uninit(AVFilterContext *ctx)
{
AudioDialogueEnhanceContext *s = ctx->priv;
av_freep(&s->window);
av_frame_free(&s->in_frame);
av_frame_free(&s->center_frame);
av_frame_free(&s->out_dist_frame);
av_frame_free(&s->windowed_frame);
av_frame_free(&s->windowed_out);
av_frame_free(&s->windowed_prev);
av_tx_uninit(&s->tx_ctx[0]);
av_tx_uninit(&s->tx_ctx[1]);
av_tx_uninit(&s->itx_ctx);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
},
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
};
const AVFilter ff_af_dialoguenhance = {
.name = "dialoguenhance",
.description = NULL_IF_CONFIG_SMALL("Audio Dialogue Enhancement."),
.priv_size = sizeof(AudioDialogueEnhanceContext),
.priv_class = &dialoguenhance_class,
.uninit = uninit,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(outputs),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
.activate = activate,
.process_command = ff_filter_process_command,
};
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